package edu.gyc.test;

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;

class MyCache{
    private volatile Map<String, Object> map = new HashMap<>();

    private ReentrantReadWriteLock rwLock = new ReentrantReadWriteLock();
    public void put(String key, Object value) {
        rwLock.writeLock().lock();
        try {
            System.out.println(Thread.currentThread().getName()+"\t正在写入："+key);
            try {
                Thread.sleep(300);
            }catch (InterruptedException e){
                e.printStackTrace();
            }
            map.put(key, value);
            System.out.println(Thread.currentThread().getName()+"\t写入完成："+key);
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            rwLock.writeLock().unlock();
        }

    }

    public void get(String key) {
        rwLock.readLock().lock();
        try {
            System.out.println(Thread.currentThread().getName()+"\t正在读取："+key);
            try {
                Thread.sleep(300);
            }catch (InterruptedException e){
                e.printStackTrace();
            }
            Object result = map.get(key);
            System.out.println(Thread.currentThread().getName()+"\t读取完成："+result);
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            rwLock.readLock().unlock();
        }

    }
}
public class ReadWriteLockDemo {
    public static void main(String[] args) {
        MyCache myCache=new MyCache();
        for (int i = 0; i < 5; i++) {
            final int tempInt=i;
            new Thread(()->{
                myCache.put(tempInt+"",tempInt+"");
            },String.valueOf(i)).start();
        }

        for (int i = 0; i < 5; i++) {
            final int tempInt=i;
            new Thread(()->{
                myCache.get(tempInt+"");
            },String.valueOf(i)).start();
        }
    }
}
